I just installed the latest version with the older Space X Barge mod. This is a minor issue probably due to this older mod. Other than that, it appears to work.
When adding the barge Facility type, I chose recovery base, but there is not box to enter the tracking distance. I assume it defaults to zero, and that is makes it invisible from the KSC tracking station.
I have a work-around. I dropped a probe core on the barge, and I can see it from the KSC tracking station.
(Also, I am running KSP 1.61 with RO and RSS.)
Thanks for the mod,,
Rich